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Whether it yellows depends on which film you use. Some are better than others. They're ultimately designed to be temporary, though. I never had any yellowing issues with 3Ms products. I've heard good things about XPel as well.
Opticoat just got a lot more expensive, and in line with their recommendation I had PolishedImage in Tacoma, WA use CQuartzUK instead, and it looks and performs absolutely beautifully. With window tint included, it came out to over $800. I think the paint correction and application were about $500-540 for the CQuartz alone. That's probably on the higher end of the spectrum, but they are an extremely high quality shop.
You can do it yourself, but it will kill half a day of your time to do it correctly, and if you don't have experience in detailing and polishing, it's going to be a whole lot harder.
This would be a lot better answered in the detailing subforum though.
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